Hand flappers

Those useless batshit human things with big balls from the 2006 book All Tomorrows. They used to be able to fly but lost the ability to, so they just used their big-ass webbed hands for courtship display. They were made because of the Qu’s messed up alien religion.

The hand flappers went extinct because they couldn’t build tools.

Hand flappers went extinct because they were useless.